What are some common horizontal directional drilling rig malfunctions?
Jun 03, 2026| 1. Power System Failure
Symptoms: Engine fails to start, insufficient power, stalls under load, excessive fuel consumption, or overheating.
Causes: Depleted battery, clogged diesel fuel filter, air intake in the fuel system, clogged radiator, or insufficient coolant.
Solutions: Check battery voltage and charge or replace; clean or replace the diesel fuel filter; purge air from the fuel lines; clean the radiator and top up coolant.
2. Hydraulic System Failure
Symptoms: Hydraulic oil temperature too high, unresponsive control levers, insufficient push/pull force, abnormal hydraulic motor operation.
Causes: Contaminated or aged hydraulic oil, worn pump or distribution valve, leaking or clogged lines, clogged filter.
Solutions: Regularly change hydraulic oil and filter; check tank cleanliness; tighten joints or replace damaged oil lines; test pump and valve sensitivity.
3. Guiding System Failure
Symptoms: Loss of guidance signal, severe deviation in display, inability to adjust direction.
Causes: Low battery power of the guide probe, signal interference from underground pipelines or metal, uncalibrated system, or damaged instrument.
Solutions: Replace the probe battery and ensure it is waterproof; avoid interference sources such as high-voltage lines; recalibrate the system before construction; if necessary, use dual-frequency or gyro guidance to improve accuracy.
4. Drill Rod/Drill Bit Related Faults
Symptoms: Drill rod jamming or breakage, severely worn drill bit, mud leakage at the joint.
Causes: Excessive operating angle, excessively hard formation, drill rod fatigue or poor quality, improper installation leading to thread wear.
Solutions: Control the drilling angle to avoid sharp turns; use high-strength wear-resistant drill bits; use a torque wrench for proper installation; regularly check the condition of the drill rod.
5. Mud System Faults
Symptoms: Mud pump not pressurized, poor flow, borehole collapse or borehole failure.
Causes: Worn mud pump piston or seals, improper mud ratio (insufficient viscosity), blocked pipelines, or filter screen clogged with debris.
Troubleshooting:
6. Electrical System Failure
Symptoms: Control panel malfunction, motor not working, alarm light constantly on.
Causes: Aging or poor contact of cables, damaged controller, blown fuse or short circuit.
Troubleshooting: Use a multimeter to check circuit continuity, replace aging cables and clean rusted terminals, check PLC module or reload program.
7. Retractor and Retractor Failure
Symptoms: Pipe cannot be pulled, retractor stuck, pipe breaks during retractor operation.
Causes: Retractor diameter designed too large, insufficient mud lubrication, excessive retractor speed, path deviation or formation change. Solution: Control the backflow ratio between 1.3 and 1.5 times the outer diameter of the pipe, increase the pressure of the mud pump to ensure sufficient lubrication, select PE or steel pipe materials with high tensile strength, and avoid intermittent stops that may cause adhesion.
